Heater



FIG. 1 is a front, right, top perspective view of the heater;

FIG. 2 is a rear, left, top perspective view of the heater of FIG. 1;

FIG. 3 is a rear, right, bottom perspective view of the heater of FIG. 1;

FIG. 4 is a front elevation view of the heater of FIG. 1;

FIG. 5 is a rear elevation view of the heater of FIG. 1;

FIG. 6 is a top plan view of the heater of FIG. 1;

FIG. 7 is a bottom plan view of the heater of FIG. 1;

FIG. 8 is a right elevation view of the heater of FIG. 1; and,

FIG. 9 is a left elevation view of the heater of FIG. 1.

The broken lines represent portions of the structure that form no part of the claim. 

CLAIM The ornamental design for a heater, as shown and described. 